21242511359 has 4 divisors (see below), whose sum is σ = 21365300616. Its totient is φ = 21119722104.

The previous prime is 21242511349. The next prime is 21242511413. The reversal of 21242511359 is 95311524212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21242511359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242511349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61394369 + ... + 61394714.

It is an arithmetic number, because the mean of its divisors is an integer number (5341325154).

Almost surely, 2^21242511359 is an apocalyptic number.

21242511359 is a deficient number, since it is larger than the sum of its proper divisors (122789257).

21242511359 is a wasteful number, since it uses less digits than its factorization.

21242511359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122789256.

The product of its digits is 21600, while the sum is 35.

The spelling of 21242511359 in words is "twenty-one billion, two hundred forty-two million, five hundred eleven thousand, three hundred fifty-nine".